Just for the record the phrase in The Right Stuff is “push the outside of the envelope”, not “push the envelope” as so many people seem to think (chapter one, page 45, in my copy of the book, is the first time Mr. Wolf used the phrase.
I think it is missing the Indigo. The spectral colors of the rainbow are designated violet, indigo, blue, green, yellow, orange, and red. One of them is definitely missing, if not the red, then the red shone is more like magenta.
Just for the record the phrase in The Right Stuff is “push the outside of the envelope”, not “push the envelope” as so many people seem to think (chapter one, page 45, in my copy of the book, is the first time Mr. Wolf used the phrase.